If you are having a problem with an electrical component in your vehicle the first place to start is in the fuse box. Most cars have a few different fuse boxes. Most of the time, one is in the engine bay and a second is in the vehicle somewhere under the dash or on a kick panel. The engine bay fuse box usually holds the larger fuses for things like the alternator, electric fans or starter. The fuse panel inside usually houses the smaller fuses for things like the brake lights, clock and radio. There will be a diagram of which fuse goes to what on the underside of the cover or in your owner’s manual. Find the fuse for the component you are having problems with and pull it out. If the glass or plastic appears dark or burnt the fuses is probably blow and should be replaced.
Suppose the horns don't work. Where do you start your troubleshooting? Here's a good procedure: 1. Check the fuses. 2. Check for voltage to the horns at the horn connector. Push the horn button or jump the wire to ground to actuate the relay. If you have voltage the horns should be operable, so search elsewhere for the problem. 3. Check for voltage at the horn button. While there, check to be sure the button's contacts touch each other when pushed. If everything's ok, go to the relay. 4. With someone pushing the horn button, check for voltage (on the low-current wire coming from the dash) on the relay. If there is voltage, the relay isn't working, right?
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